<!DOCTYPE html>
<html>
<body>
    <h1>JavaScript 箭头函数</h1>
    <p>IE11 或更早版本不支持箭头功能。</p>
    <p id="demo"></p>
    <script>
        const x = (x, y) => {
            return x * y
        };
        document.getElementById("demo").innerHTML = x(5, 5);
    </script>
</body>
</html>
